|Lara Croft: Tomb Raider
Alex is a tomb raider just as Lara. They were partners once, but then Alex betrayed Lara.
In the movie he works for the bad guys, namely Manfred Powell, but he is basically a good guy who just wants to earn some quick money.
Alex West was played by Daniel Craig, who later portrays British spy James Bond.
Originally the character was supposed to be called Alex Maas (sometimes named Alex Mars, but the subtitles say Maas) director Simon West got a last minute fax from his film studio Paramount telling him that the name had not been cleared legally, so he had to change it. The easiest solution for him was to give him the name of his father, that's how he came to the name Alex West. 
- Lara Croft Tomb Raider: The Cradle of Life, DVD, Director's Commentary